On Tue, 22 Sep 2015, Blaise A Bourdin wrote:

With the later configuration, it looks like what matters is the order in which -lmpifort and -lifcore are listed: This one works: mpif90 -Wl,-multiply_defined,suppress -Wl,-multiply_defined -Wl,suppress -Wl,-commons,use_dylibs -Wl,-search_paths_first -g -O0 -I/opt/HPC/petsc-dev/include/petsc/finclude -o ex5f90 ex5f90.o -Wl,-rpath,/opt/HPC/petsc-dev/Darwin-intel16.0-g/lib -L/opt/HPC/petsc-dev/Darwin-intel16.0-g/lib -lpetsc -Wl,-rpath,/opt/intel-16.0/compilers_and_libraries_2016.0.083/mac/compiler/lib -L/opt/intel-16.0/compilers_and_libraries_2016.0.083/mac/compiler/lib -Wl,-rpath,/opt/intel-16.0/compilers_and_libraries_2016.0.083/mac/mkl/lib -lifcore -lmpifort

This one does not: mpif90 -Wl,-multiply_defined,suppress -Wl,-multiply_defined -Wl,suppress -Wl,-commons,use_dylibs -Wl,-search_paths_first -g -O0 -I/opt/HPC/petsc-dev/include/petsc/finclude -o ex5f90 ex5f90.o -Wl,-rpath,/opt/HPC/petsc-dev/Darwin-intel16.0-g/lib -L/opt/HPC/petsc-dev/Darwin-intel16.0-g/lib -lpetsc -Wl,-rpath,/opt/intel-16.0/compilers_and_libraries_2016.0.083/mac/compiler/lib -L/opt/intel-16.0/compilers_and_libraries_2016.0.083/mac/compiler/lib -Wl,-rpath,/opt/intel-16.0/compilers_and_libraries_2016.0.083/mac/mkl/lib -lmpifort -lifcore

Does linking with -lifcore vs /opt/intel-16.0/compilers_and_libraries_2016.0.083/mac/compiler/lib/libifcore.a make a difference? And what do you have for: cd /opt/HPC/mpich-3.1.4-intel16.0/lib ls nm -Ao libmpiifort.* |grep get_command_argument BTW: I'm assuming you have sept 20 or newer petsc master branch. Satish